Cant copy at 8 speed in nero

please help as i am so , i have been previously copying my backups at 4 speed with a lite on SOHW-832S writer and samsung SD-616E reader using nero, i have recently started getting problems when i upgraded to ritek 8x disks, (i have a mate who is well into computers but he cant help). the used read buffer drops to 0% then my lite on drive stops copying to let the read buffer go back up to 100% and so on until the disk is copied but i am getting faults on the new disk (also takes about 15+ minutes to copy)
please can anyone help me, thanks

Please dont cross post.

I have answered you here (& lots of others have as well)